Hello world!

How many times has the phrase “Hello world!” appeared on a computer output device?  The first time I ever caused it to happen was back in about 1978 on the system console of a DEC PDP 11/34.  That day was also the first time that I ever laid my hands on a computer – and somewhere around here I still have the hard copy of my very first login session.  Maybe someday when I am famous it’ll be worth taking that piece of paper to the Antiques Roadshow for an appraisal!